test with kerkour architecture (https://kerkour.com/rust-web-application-clean-architecture)

src/config.rs

@@ -0,0 +1,53 @@
+use anyhow::Error;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Config {
+    pub http: Http,
+    pub database: Database,
+    pub graphql: Grapthql,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Http {
+    pub host: String,
+    pub port: u16,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Database {
+    pub url: String,
+    pub pool_size: u32,
+    pub max_lifetime: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Grapthql {
+    pub schema_location: String,
+}
+
+impl Config {
+    pub fn load() -> Result<Self, Error> {
+        dotenv::dotenv().ok();
+
+        let http = envy::prefixed("HTTP_")
+            .from_env::<Http>()
+            .expect("Failed to load http config");
+
+        let database = envy::prefixed("DATABASE_")
+            .from_env::<Database>()
+            .expect("Failed to load database config");
+
+        let graphql = envy::prefixed("GRAPHQL_")
+            .from_env::<Grapthql>()
+            .expect("Failed to load graphql config");
+
+        let config = Self {
+            http,
+            database,
+            graphql,
+        };
+
+        Ok(config)
+    }
+}